[Bug 91365] New: VT switching breaks display on Broadwell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91365

            Bug ID: 91365
           Summary: VT switching breaks display on Broadwell
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: thatslyude at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Hi. So, this is a pretty bad bug that I've been able to reproduce with multiple
machines. The display goes bonkers when switching to a virtual terminal from
Xorg. The display starts scrolling up and down like an old film projector with
tons of visible corruption, and if left long enough eventually stops so half
the screen is at the top and the rest of the screen is at the bottom. The only
way to get it back to normal is to do something that starts up the 3D
acceleration (such as opening the activities overlay in GNOME). Unfortunately,
doing this so many times eventually puts the display in a state where recovery
is impossible without rebooting. I've been able to reproduce this on:

- The ThinkPad T450s
- The ThinkPad X1 Carbon (latest revision)
- Chromebook Pixel

All of these systems are running Fedora 22, updated to the latest stable
revision of the driver. I've tried building a mainline kernel, but the problem
remains present. The version of the xorg driver is 2.99.197.

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